awk合并文件问题

cxfcxf

f1:

a
b
c
d

f2:
e
f
g

awk '{printf("file->[%s] NR->[%d] FNR->[%d] str->[%s]\n", FILENAME, NR, FNR, $0)}' f1 f2output:

file->[f1] NR->[1] FNR->[1] str->[a]
file->[f1] NR->[2] FNR->[2] str->
file->[f1] NR->[3] FNR->[3] str->[c]
file->[f1] NR->[4] FNR->[4] str->[d]
file->[f2] NR->[5] FNR->[1] str->[e]
file->[f2] NR->[6] FNR->[2] str->[f]
file->[f2] NR->[7] FNR->[3] str->[g]

网上找了下- -看到一个很强的解释..这个很好....懂了....